When I was a kid, I used to deal with the John Meshna
company. They sold great electronic surplus.
Supposedly, the government once sold a lot of
Sidewinder missile IR seeker heads to them, which they
then sold to hobbyists. These were highly classified
at the time, and this was a big boo-boo. Meshna
turned over their buyer records, and the government
recovered the parts.
--Bill